what's the difference vs wow

what's the difference

phrase
  • The difference does not matter; so what? 

  • Used other than figuratively or idiomatically: see what, is, the, difference. 

wow

verb
  • To amaze or awe. 

noun
  • Anything exceptionally surprising, unbelievable, outstanding, etc. 

  • A relatively slow form of flutter (pitch variation) which can affect both gramophone records and tape recorders. 

intj
  • An expression of amazement, awe, or admiration. 

  • An indication of excitement, surprise, astonishment, or pleasure. 

  • Used sarcastically to express disapproval of something. 

How often have the words what's the difference and wow occurred in a corpus of books? (source: Google Ngram Viewer )